[NTG-context] Strange vertical result with itemize in columns

Hi, the following example generates (with latest standalone) the attached result. As you can see, the final item is not correctly aligned vertically. Am I doing something wrong, or is it a bug? /Mikael PS Yes, I use \displaystyle in the real example, but the same error exist with this simpler example. \starttext \startTEXpage[offset=2bp] \startitemize[n] \startitem Let $f(x)=\sin x$ and $g(x)=x$. Discuss the limits \startitemize[a,columns,three][left=,right={)},stopper=] \startitem $\lim_{x\to 0}\frac{f(x)}{g(x)}$,\stopitem \startitem $\lim_{x\to+\infty}\frac{f(x)}{g(x)}$,\stopitem \startitem $\lim_{x\to 0}f(x)$.\stopitem \stopitemize \stopitem \stopitemize \stopTEXpage \stoptext